\begin{tabular}{l*{11}{c}}
\hline
                 &\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}\\         &\multicolumn{1}{c}{4}&\multicolumn{1}{c}{5}&\multicolumn{1}{c}{6}&\multicolumn{1}{c}{7}&\multicolumn{1}{c}{8}&\multicolumn{1}{c}{9}&\multicolumn{1}{c}{10}&\multicolumn{1}{c}{11}&\multicolumn{1}{c}{12}&\multicolumn{1}{c}{13}&\multicolumn{1}{c}{14}\\ \hline  \emph{Second stage}\\
Enrollment  &      -0.248   &       0.454   &       0.143   &      -0.033   &       0.336   &       0.682*  &       0.610   &      -0.589   &       0.425   &       0.875   &       0.985*  \\
            &     (0.454)   &     (0.498)   &     (0.398)   &     (0.442)   &     (0.380)   &     (0.398)   &     (0.480)   &     (0.517)   &     (0.538)   &     (0.584)   &     (0.587)   \\
\hline
Controls    &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   \\
F-stat      &         227   &         236   &         240   &         236   &         235   &         237   &         229   &         227   &         230   &         238   &         240   \\
N           &        3667   &        3663   &        3647   &        3627   &        3600   &        3578   &        3546   &        3522   &        3477   &        3429   &        3396   \\
Mean of Y   &        1.99   &        1.92   &        1.84   &        1.79   &        1.81   &        1.79   &        1.96   &        2.06   &        2.06   &        2.12   &        2.09   \\
\hline
\end{tabular}
